#!/bin/bash
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# Manipulate options in a .config file from the command line
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myname=${0##*/}
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# If no prefix forced, use the default BR2_
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BR2_PREFIX="${BR2_PREFIX-BR2_}"
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usage() {
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cat >&2 <<EOL
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Manipulate options in a .config file from the command line.
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Usage:
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$myname options command ...
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commands:
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--enable|-e option Enable option
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--disable|-d option Disable option
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--set-str option string
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Set option to "string"
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--set-val option value
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Set option to value
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--undefine|-u option Undefine option
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--state|-s option Print state of option (n,y,m,undef)
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--enable-after|-E beforeopt option
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Enable option directly after other option
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--disable-after|-D beforeopt option
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Disable option directly after other option
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commands can be repeated multiple times
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options:
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--file config-file .config file to change (default .config)
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--keep-case|-k Keep next symbols' case (dont' upper-case it)
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--package|-p Operate on package (set prefix to BR2_PACKAGE_)
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$myname doesn't check the validity of the .config file. This is done at next
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make time.
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By default, $myname will upper-case the given symbol. Use --keep-case to keep
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the case of all following symbols unchanged.
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$myname uses 'BR2_' as the default symbol prefix. Set the environment
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variable BR2_PREFIX to the prefix to use. Eg.: BR2_PREFIX="FOO_" $myname ...
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EOL
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exit 1
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}
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checkarg() {
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ARG="$1"
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if [ "$ARG" = "" ] ; then
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usage
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fi
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if [ "$MUNGE_CASE" = "yes" ] ; then
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ARG="`echo $ARG | tr a-z- A-Z_`"
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fi
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case "$ARG" in
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${BR2_PREFIX}*)
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ARG="${ARG/${BR2_PREFIX}/}"
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;;
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esac
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}
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txt_append() {
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local anchor="$1"
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local insert="$2"
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local infile="$3"
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local tmpfile="$infile.swp"
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# sed append cmd: 'a\' + newline + text + newline
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cmd="$(printf "a\\%b$insert" "\n")"
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sed -i -e "/$anchor/$cmd" "$infile"
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}
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txt_subst() {
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local before="$1"
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local after="$2"
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local infile="$3"
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local tmpfile="$infile.swp"
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sed -i -e "s:$before:$after:" "$infile"
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}
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txt_delete() {
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local text="$1"
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local infile="$2"
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local tmpfile="$infile.swp"
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sed -i -e "/$text/d" "$infile"
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}
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set_var() {
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local name=$1 new=$2 before=$3
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name_re="^($name=|# $name is not set)"
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before_re="^($before=|# $before is not set)"
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if test -n "$before" && grep -Eq "$before_re" "$FN"; then
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txt_append "^$before=" "$new" "$FN"
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txt_append "^# $before is not set" "$new" "$FN"
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elif grep -Eq "$name_re" "$FN"; then
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txt_subst "^$name=.*" "$new" "$FN"
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txt_subst "^# $name is not set" "$new" "$FN"
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else
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echo "$new" >>"$FN"
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fi
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}
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undef_var() {
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local name=$1
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txt_delete "^$name=" "$FN"
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txt_delete "^# $name is not set" "$FN"
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}
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if [ "$1" = "--file" ]; then
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FN="$2"
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if [ "$FN" = "" ] ; then
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usage
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fi
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shift 2
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else
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FN=.config
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fi
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if [ "$1" = "" ] ; then
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usage
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fi
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MUNGE_CASE=yes
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while [ "$1" != "" ] ; do
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CMD="$1"
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shift
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case "$CMD" in
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--keep-case|-k)
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MUNGE_CASE=no
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continue
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;;
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--package|-p)
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BR2_PREFIX="BR2_PACKAGE_"
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continue
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;;
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--*-after|-E|-D|-M)
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checkarg "$1"
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A=$ARG
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checkarg "$2"
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B=$ARG
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shift 2
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;;
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-*)
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checkarg "$1"
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shift
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;;
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esac
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case "$CMD" in
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--enable|-e)
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set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=y"
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;;
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--disable|-d)
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set_var "${BR2_PREFIX}$ARG" "# ${BR2_PREFIX}$ARG is not set"
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;;
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--set-str)
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# sed swallows one level of escaping, so we need double-escaping
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set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=\"${1//\"/\\\\\"}\""
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shift
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;;
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--set-val)
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set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=$1"
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shift
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;;
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--undefine|-u)
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undef_var "${BR2_PREFIX}$ARG"
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;;
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--state|-s)
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if grep -q "# ${BR2_PREFIX}$ARG is not set" $FN ; then
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echo n
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else
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V="$(grep "^${BR2_PREFIX}$ARG=" $FN)"
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if [ $? != 0 ] ; then
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echo undef
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else
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V="${V/#${BR2_PREFIX}$ARG=/}"
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V="${V/#\"/}"
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V="${V/%\"/}"
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V="${V//\\\"/\"}"
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echo "${V}"
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fi
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fi
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;;
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--enable-after|-E)
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set_var "${BR2_PREFIX}$B" "${BR2_PREFIX}$B=y" "${BR2_PREFIX}$A"
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;;
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--disable-after|-D)
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set_var "${BR2_PREFIX}$B" "# ${BR2_PREFIX}$B is not set" "${BR2_PREFIX}$A"
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;;
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*)
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usage
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;;
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esac
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done
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